Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

Her answer is incorrect.  She is better off writing the expression x + .06X as 6% is expressed as .06 as a decimal.  Adding sales tax would mean taking the initial cost x and adding the tax of .06x to it for the total cost after taxes.

Step-by-step explanation:

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.